F-Secure's proprietary update validation mechanism will expire and hotfixes are required to ensure that affected products continue receiving updates after Monday, May 27th 2013. Installation of the hotfixes are mandatory to ensure that products receive and install new incoming updates and continue working normally in the following scenarios.
Impact: Affected products that are installed AFTER the old signing mechanism has expired will be unable to validate and install some or all updates downloaded from F-Secure.
The affected product versions are:
Note: Affected products that were installed and receiving updates PRIOR to the expiration date will continue to work normally without user action.
Note: Protection Service for Business 9.x hotfix is delivered through channel update and should not require further activities from the user. Other products require an administrator to apply the hotfix.
Note: Restart is not required after installing this hotfix.
More details from Support News.